US3588544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal generating circuits using internal semiconductor capacitance
Assignee: Hazeltine Research Inc
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Filing: 1968-03-20
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Granted: 1971-06-28
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Expires: 1988-03-20
Abstract
Abstract DISCLOSED IS A SEMICONDUCTOR SIGNAL GENERATING CIRCUIT WHICH REQUIRES NO DISCRETE CAPACITIVE ELEMENTS FOR OPERATION AND THEREFORE MAY BE READILY CONSTRUCTED IN INTEGRATED CIRCUIT FORM. THE CIRCUIT INCLUDES A PAIR OF TRANSISTORS WHICH ARE SUPPLIED, THROUGH ASSOCIATED CIRCUITRY, WITH A PULSE-TYPE CONTROL SIGNAL. IN RESPONSE TO THIS CONTROL SIGNAL THE CHARGING AND DISCHARGING OF THE INTERNAL CAPACITANCE OF THESE TRANSISTORS IS CONTROLLED TO DEVELOP AN OUTPUT SIGNAL HAVING AN AMPLITUDE WHICH IS PROPORTIONAL TO THE AMPLITUDE OF THE SUPPLIED PULSETYPE SIGNAL AND WHICH REMAINS SUBSTANTIALLY CONSTANT FOR A SELECTED TIME INTERVAL.
Inventors
- 👤 Clarence Robert Wallingford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:05
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/26; H03K3/28; H03K3/281; H03K3/282; H03K4/00; H03K4/06; H03K4/08; H03K4/48; H03K5/00; H03K5/01
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |